| 四能级系统自发辐射场的非线性特性 |
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| 引用本文： | 武强,刘正东,田维坚. 四能级系统自发辐射场的非线性特性[J]. 激光与红外, 2002, 32(5): 306-308 |
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| 作者姓名： | 武强 刘正东 田维坚 |
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| 作者单位： | 1. 浙江大学物理系,浙江,杭州,310027
2. 中国科学院西安光学精密机械研究所,陕西,西安,710068 |
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| 基金项目： | 国家自然科学基金 (10 0 740 5 6)，国家 863基金 (863 -4 16-1-1-H11)，国家 863基金 (2 0 0 1AA13 10 70 )资助 |
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| 摘 要： | 研究在三个驱动场作用下四能级原子模型中量子干涉对自发辐射场的影响。通过求解相互作用表象下的运动方程得到系统自发辐射场共振模对应的原子电磁极化率随驱动场Rabi频率的变化规律。结果显示，此系统突破了传统非线性效应强场条件的限制，即使是弱的自发辐射场仍可具有强烈的非线性特性，这一新现象在量子器件制备，弱信号检测，量子信息处理等领域有重大应用前景。
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| 关 键 词： | 四能级系统 自发辐射场 量子干涉 非线性效应 弱场 |
| 文章编号： | 1001-5078(2002)05-0306-03 |
| 修稿时间： | 2002-08-14 |
Nonlinear Effects of the Spontaneous Emission in Four-level Atomic System Coupled by Weak Fields |
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| WU Qiang,LIU Zheng-dong,TIAN Wei-jian. Nonlinear Effects of the Spontaneous Emission in Four-level Atomic System Coupled by Weak Fields[J]. Laser & Infrared, 2002, 32(5): 306-308 |
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| Authors: | WU Qiang LIU Zheng-dong TIAN Wei-jian |
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| Affiliation: | WU Qiang1,LIU Zheng-dong1,TIAN Wei-jian2 |
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| Abstract: | The quantum interference is studied in a spontaneous emission of a four-level atom driven by three coherent fields. Deriving the equation of motion in the interaction picture we obtain the susceptibility. It is shown the susceptibility is different from the conventional nonlinear optics. The atom exhibits strong nonlinear effects when the spontaneous is at resonance, though it is weak. We can apply this new phenomenon to many fields such as making quantum device, detecting weak signal and processing quantum information. |
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| Keywords: | quantum interference nonlinear effects weak field |
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